[英]Find specific array, deep in a nested Mongo collection
I have a nested Mongo collection which looks like the following: 我有一个嵌套的Mongo集合,看起来像下面这样:
{
"_id": "BaiD76JR3gZFPKchn",
"ownerAdmin": "NsgdNHh84XrBJALAK",
"activities": [
{
"id": "a1",
"email": "itsarmin@gmail.com",
"type": "image",
"description": "Another one",
"createdAt": "2017-10-25T21:39:44.769Z",
"pins":
"action": "https://www.dropbox.com/as"
},
{
"id": "a2",
"email": "itsarmin@gmail.com",
"type": "image",
"description": "Comment This image For me",
"createdAt": "2017-10-25T18:42:00.484Z",
"action": "https://www.dropbox.com/s/bty2ds"
},
{
"id": "a3"
"email": "armin@four1five.com",
"type": "progress",
"description": "dasd",
"createdAt": "2017-10-24T17:28:11.748Z",
"action": 50
}
],
"createdAt": "2017-10-24T17:27:54.828Z"
}
I'm trying to query using Collection.findOne("BaiD76JR3gZFPKchn",)
, to return an object in "activities" using 2 field "id:a2" AND "type:image", so I end up with : 我正在尝试使用Collection.findOne("BaiD76JR3gZFPKchn",)
进行查询,以使用2个字段“ id:a2”和“ type:image”返回“活动”中的对象,因此我最终得到:
{
"id": "a2",
"email": "itsarmin@gmail.com",
"type": "image",
"description": "Comment This image For me",
"createdAt": "2017-10-25T18:42:00.484Z",
"action": "https://www.dropbox.com/s/bty2ds"
}
Try adding projection into your query. 尝试在您的查询中添加投影。
db.collection.findOne( { _id: "BaiD76JR3gZFPKchn" },
{ activities: { $elemMatch: { id: "a2",type:"image"} }, _id: 0 })
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